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ADF4001 RF input issue

Category: Hardware
Product Number: adf4001

I have an issue with the ADF4001. The VCO output is connected to the RF_IN_A input of the ADF4001.  I have measured the signal of the VCO to be about 1Vpp.

However, if I measure the output of the N- counter at the MUXOUT, there is no signal. R-counter does work at the muxout. 

The VCO type is CVCO33CL-0110-0150 of Crystek. 

Does anybody know what is wrong?